Oral irrigator



FIG. 1 is a front, top and left side perspective view of oral irrigator, showing my new design;

FIG. 2 is a front view thereof

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof,

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawing illustrate portions of the article and form no part of the claimed design. 

CLAIM The ornamental design for an oral irrigator, as shown and described. 